package com.xiaoke;


import java.util.ArrayList;

public class helloworld {
  public static void main(String[] args) {
    ArrayList<String> array = new ArrayList<String>();
    array.add("hello");
    array.add("world");
    System.out.println(array);

    String s = "heoll";
    String t = s;
    t = "je";

    int[] arr = {1, 2, 3};

  }

}

